Composer
Director
Screenwriter
Main Role
- Kim Nam GilSong Ha YeongMain Role
- Jin Seon KyuKook Yeong SuMain Role
- Kim So JinYun Tae GuMain Role
Support Role
- RyeounJung U Ju [Crime Behavior Analysis Team member / Statistical analyst]Support Role
- Lee Dae YeonBaek Jun SikSupport Role
- Kim Won HaeHeo Gil PyoSupport Role
- Jung Soon WonNam Il Yeong [Regional Investigation Unit Section 1 Team 1 member]Support Role
- Ha Do GwonSin Gi Ho ["Fact Today" director]Support Role
- Kong Seong HaChoi Yun Ji ["Fact Today" reporter]Support Role
- Lee Ha NeeIm Mu Sik [Reporter]Support Role
- Kim Hye OkPark Yeong Sin [Ha Yeong's mother]Support Role
- Jo Young JinLee Jin Cheol [Commissioner general]Support Role
- Hong Woo JinO In TakSupport Role
- Seo Dong GabKim Bong SikSupport Role
Guest Role
- Shin Dong Eun[Reporter]Guest Role
- Kim Yun Seul[Cotton candy girl] (Ep. 1)Guest Role
- Kim Kwan Mo[Undercover cop in drag] (Ep. 1)Guest Role
- Choi Da Young[Nurse] (Ep. 1)Guest Role
- Hwang Jung Min['Turtle' supermarket owner] (Ep. 1)Guest Role
- Heo Seon Haeng[Medical examiner] (Ep. 1)Guest Role
- Kim Deok Ju[Hwa Yeon's landlord] (Ep. 1)Guest Role
- Lee Si Young[Neighborhood single mother] (Ep. 1)Guest Role
- Bang Jung Hyun[Detective] (Ep. 1)Guest Role
- Park Jin Young[Doctor] (Ep. 1)Guest Role
- Yoon Hye RiChoi Hwa Yeon [Murder victim] (Ep. 1-2)Guest Role
- Oh Kyung JooBang Gi Hun [Hwa Yeon's boyfriend] (Ep. 1-2)Guest Role
- Oh Hee JoonKang Yu Min [Daebong Police Substation] (Ep. 1-2)Guest Role
- Go Geon HanYang Yong Cheol [Man claiming to be the "Red Cap Case" murderer] (Ep. 1-2)Guest Role
- Oh Seung HoonJo Gang Mu [Serial killer] (Ep. 1-2)Guest Role
- Lee Chun MooSong Ha Yeong [Young] (Ep. 1, 11)Guest Role
- Moon Dong HyukMoon Tae Su [Detective at Dongbu Police Station] (Ep. 1-2, 11)Guest Role
- Kim Hyun[Hwa Yeon's mother] (Ep. 1-2, 11)Guest Role
- Jung Man ShikPark Dae Ung [Detective at Dongbu Police Station] (Ep. 1-2, 11-12)Guest Role
- Cheon Dong Been[Deliveryman] (Ep. 2)Guest Role
- Noh Ha YeonLee Su Hyeon [Murder victim] (Ep. 2-3)Guest Role
- Lee Gi SeobKang Jin Gu (Ep. 3)Guest Role
- Lee Jong YoonJang Deuk Hok (Ep. 3)Guest Role
- Bae Sung Il[Detective] (Ep. 3)Guest Role
- Jung Chung Gu[Film developer] (Ep. 3)Guest Role
- Park Yoo MilLim Hyron Ju (Ep. 3)Guest Role
- Lee Jae EunMrs. Kim [Motel owner] (Ep. 3)Guest Role
- Ki Hwan[Su Hyeon's father] (Ep. 3-4)Guest Role
- Lee Hun Joo[Su Hyeon's mother] (Ep. 3-4)Guest Role
- Kwon Eun SungLee Ji Uk [Su Hyeon's brother] (Ep. 3-4)Guest Role
- Son Young SunLee Chun Yeong [Elderly recycler] (Ep. 3-4)Guest Role
- Woo Jung KookCho Hyeon Gil (Ep. 3-5)Guest Role
- Jung Young Keum[Hyeon Gil's landlord] (Ep. 4)Guest Role
- Choi Nam Wook[Convenience store owner] (Ep. 4)Guest Role
- Han Joon WooKoo Yeong Chun (Ep. 4-8)Guest Role
- Goo Sung HwanHwang Dae Seon (Ep. 5)Guest Role
- Seo Myung ChanHan Seok Hun [Professor] (Ep. 5)Guest Role
- Hwang In Joon[Detective] (Ep. 5)Guest Role
- Oh Kyu Taek[Man drinking with prosecutor] (Ep. 5)Guest Role
- Seon Yool Woo[Detective] (Ep. 5-7, 9-10)Guest Role
- Hong Ye Ji[Bookstore employee] (Ep. 6)Guest Role
- Kim Joong HeeNam Gi Tae [Killer] (Ep. 6-10)Guest Role
- Lee Geun HooKwak Man Hyeon (Ep. 7)Guest Role
- Lee Jae WooDetective Kim (Ep. 7)Guest Role
- Kim Bum Joon[Witness] (Ep. 7)Guest Role
- Yoo Yong[Detective] (Ep. 7)Guest Role
- Lee Dong Kyu[Anchorman] (Ep. 7)Guest Role
- Kim Kyung MinProfessor An (Ep. 7, 9)Guest Role
- Sung No Jin[Forensics examiner] (Ep. 7, 9)Guest Role
- Kim Joo Ah[Columbarium employee] (Ep. 9)Guest Role
- Choi Min Hyeok[Victim] (Ep. 9)Guest Role
- Han Dae Gwan[Victim's father] (Ep. 9)Guest Role
- Kim Hyun Tae[Witness] (Ep. 9)Guest Role
- Jang Eun Seo[Woman walking home] (Ep. 9)Guest Role
- Kim Nak Kyun[Detective] (Ep. 10)Guest Role
- Choi Sol HeeYang Ji Suk (Ep. 10-11)Guest Role
- Na ChulWoo Ho Seong (Ep. 10-12)Guest Role
- Hong Eun Jeong[Manyeon bus stop woman] (Ep. 11)Guest Role
- Lee Ye Joo[Christmas Tree girl] (Ep. 11)Guest Role
- Yoon Ga YiLee Cho Won [Geumchan Village woman] (Ep. 11)Guest Role
- Noh Eun Ha[ATM woman] (Ep. 11)Guest Role
- Bo Ra Na[Massage parlor owner] (Ep. 12)Guest Role
- Kim Bong Soo[Ji Suk's father] (Ep. 12)Guest Role
- Kim Bong Hee[Ji Suk's mother] (Ep. 12)Guest Role
- Jun Jung Il[PR manager]Guest Role
Unknown
- Yu Jae Hee Unknown
- Jo Seung Gu Unknown
- Kim Geun Young Unknown
- Lee Yu Ju Unknown
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